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Turning a Tenon

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Bill21:
The topic of whether you should accommodate the lip on standard chuck jaws came up recently.
I use Axminster C jaws and cut a very slight recess to locate the lip. I’m pretty sure I read somewhere or perhaps saw in a video that you should not do this.
The lip is supposed to bite into the wood. The lip is quite pronounced on the Axminster jaws whilst the RP have what they term a “Hawks Beak”.

It’s certainly the case that Record Power tell you not to cut a recess for their standard jaws. See their instructions in the picture below.

I’d be interested to hear others thoughts on this. Perhaps someone has a link to Axminsters advice on the topic?

Do other manufacturers have jaws with these features?

Bill21:
For anyone that doesn’t use Axminster C jaws this is what the lip looks like.

BrianH:
First opinion.... Far too many of us woodies get over-involved with angles and sizes. Advice .... leave all that precision to the engineers who are working with material with little or no movement or 'give'. Experiment and If a technique works... use it again!
Second opinion... where possible always use a chuck in contracting mode. The alternative has you turning away the wood away, reducing its inherant strength, while the chuck is doing its best to drive the grain apart.
Third opinion ... a bowl, as drawn, with a base size around 1/3 its diameter will look elegant at the cost of stability whereas one with a 2/3 base will be far more likely to be used. Advice... decide if you making an ornamental piece, or one intended for useful service BEFORE you start.
Fourth opinion ....aside from proper names there are no facts in woodyturning..... only opinions, no matter how strongly those opinions are believed.
Look forward to hearing your views
Brian

Twisted Trees:
If the wood I am putting into the chuck is really hard, then I cut a suggestion of a grove for the C Jaws to bite into, if it is normal hard then I let them make their own, except when I feel like making a groove for them! completely not helpful, but in use I have found on 99% of tenon's without a groove there is on when I take the chuck off so it successfully makes it's own, in the right place and with "stops" where the gaps in the jaws are. which is better than an all-round groove in my opinion.

Bill21:

--- Quote from: Twisted Trees on August 19, 2023, 12:47:09 PM ---If the wood I am putting into the chuck is really hard, then I cut a suggestion of a grove for the C Jaws to bite into.

--- End quote ---

That’s a good way of putting it, that’s pretty much what I do.

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